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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e495bd741521f2b98c46494eef5bb24e89e2d6309f98e95772799bdb6b5a288' 
  AND token = 'LO50K4at3GVnqyrDtquj8l08nGvIN0Gh5Ph/22ujvh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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