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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc29408ea0476f8a5c084271010fb50d27e19d2dee8d059d83df0f854ca1916' 
  AND token = '9G50e9I4OolICTRd3GLVXNqfnQ9T50M/EmTL+SbA/s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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