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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a431be07d951c6655e0409573c6f97cb3f5be4c96072c8ea9fe454ff9b95b399' 
  AND token = 'oxuQPj0oSMijNKRYGH2MZTTU5SkTMnyjNI+NAWL9S7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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