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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13fd4bf5a0d1d8ee4507dd9318ddb212f5d62c78ea8d70925f4dd9b305ab06fb' 
  AND token = 'mVpm1vMGpCI5piRPKSTtjllYqicZe7jQLfOt1Fcd7G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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