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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4d08106a284a2ab5e0866734241f10c8a8a19f926603f9b28df63c74e2646b' 
  AND token = 'GGhe8Uy27tnwMYorYlrduiVwCkYnnnj1SLgO/e2k2UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}