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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b0e925a09046c24c5014d89adbcea4b5b0b6d03b86784bdc962a9ad8c8797e' 
  AND token = 'QVeu7XDtHitn1SeX5GbAaEKDguVG0U2oOsNLZykQ0k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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