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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7d12fe3276c0f2b150f895d19d19a9879f7d07f8999806ed4c041b9cb69403' 
  AND token = 'B/kaCKREu2d59putWeEXQvU3lSk3Cv+ALu2DJmtWJTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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