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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fbd162b2829a0ba494087fa8c80898499ef693076d855e7c4e0cd9cbbb7872' 
  AND token = 'wYp6t/5TBQIKbYwC6ODd9jQc88JE6bTHnMVSxABHG44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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