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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d32781617ce479c36b8171f48b90a23b437fbfd4e7186b3481d5af56f7a9e6' 
  AND token = 'VJQOPewbdADW3hQVn+4Adgopuc7hCOL33KEEEj1l9yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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