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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb7f7cb47272517fc6e0811ffb2b1a0c445b518c1d7da79413f2a6733c37059' 
  AND token = 'Qv3I3kjptc9FBiD+cs2EADENC8UbPA8iB9w7/CIK0M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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