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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8ff3506516152ae0c0cf4f92a2a5ae2073e94f7f0276bc225cc4cb65140549' 
  AND token = '4sPjejS8HZ7lo7Ng51x/8P+SvfKP9lBwGxhdIMlVo9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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