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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf9408f4e2f0295f5a4531d597e59a33fb8005eff7ea8a47738f9edc3a0f62a' 
  AND token = 'BmPfF8OFEAwO03vs+IA6bOwBGkyxWjRPQYG6xxmbL1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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