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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b0ecddc6b830daf2a783bc2f6bb50146b84a297c8779482c0a7dc33a232177' 
  AND token = '6QENExaZd3GNwcP9cJeIuRvTLwE9erfDfBSQpAfwW1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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