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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cb592ca60a8e24446523045af2a8f095bfa9b9ca39e6cd9b13f43f3c219127' 
  AND token = 'qHr18TlsuNcVt94o8uTaiVzCrx1CiMz7+BYAHj+0Au4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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