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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c514669bcccfaf2c5d26f53c7f6b8229b7a3492ebf9456c8718719a8a2491309' 
  AND token = 'tDe9JtrJXoiddYF1CxvO+WZxVMwSkvIcltjzO9WRpC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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