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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6802d091795c4c39b2337836d90203ada7a1a2ea411405541f39bc65609f58b9' 
  AND token = 'gvgCrYIFONMflEsrSp7ZcYEVrh2YQibNWjYMdWWqHbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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