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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4f02ed4bea90e7ccd5a64122b53b7f9ed33ad069d8e0c5535fc234acf3d4d0' 
  AND token = 'RV6egMTQmUSgudoRkErgBZFVjot7/7bHkBnxPX/vNb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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