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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb539f49e799c3a3fb69ea9848c830f3f40ca0c7e94e8dc154cfed5f7c1d96e' 
  AND token = '4rIljwz1o2bvjOxqAfUF+1M9v+aUWoK6SUQOMXxtmIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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