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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074280336ab103197ce9a9632660e371e0c3265cff7ba50b87086e7ebc7a1352' 
  AND token = 'CXEZwkXBPEM9R/q1hx0O3WNEao9WpBH84te81vnA+bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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