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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b011649d4c321fbe51196aaa22b242affc54ae1cdee4ba32d090243faa4b54' 
  AND token = 'U+b0e0qzUBp90D41Ws42GpLhN1dEJTPt39PYYQOZAlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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