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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a02f6d004a0ef675b9ba4e5366896fd4402e888518a43ae541ce800d167f875' 
  AND token = 'IRU2Nj3Yf0vkrFE18l7JqmsH5RUQ46eqq3rLWHMWKMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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