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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a46d88712d715951c0b08dc4c250d78ab21cc865635bd195291ab3e550a3aa' 
  AND token = '9KP9nFjmX1ORhNXTjrGrKXVmxuRDrN1Kcfp6Q6dRSWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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