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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360e8be43c7eda16ffd35de76a5002d5edbe5a360f05405306a5da49ad7bec7e' 
  AND token = 'F2m/blOVduJsS5MiuJ5Y5VJ6eR1//l0R132JcgPFwWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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