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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a64c243afece31c0369722aba7ac2e271f09441c45166c9d5574bc5a6c21b4e' 
  AND token = 'Q1MMtKlWE3KHbboRfFZIvBAHNtv4JOiH9ZE/xJR/cDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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