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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87660c5579cb5ff4f8fcc5da9c7cbd348598361b49d294d0aabd21df5a5967d' 
  AND token = '81YHm+hgSUFkvE78vUEtM7vqXeWIsFv0AsCK7X7dXMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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