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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7458e216fffc1b31f1974afe2c11fe4192e47a85bc4ec3363f48aae8ea40812f' 
  AND token = '686UkKyfgMHCQPKeuHBCKEVBS7K5R7dlG/hgsnXrYcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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