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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd701c2fa7a528a763eef80367635e02ee0d82948f8664a7acc23300d8d7213e5' 
  AND token = 'JHx0q/UVbvsR3B54kiSGFCi27dz5+EP7lpbfXp0kvN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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