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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd881776e140a8ac3d8871642307fbeb586eb294971b206f27f5354722ccf9787' 
  AND token = 'G9YRNgQ9tG1vECc4zx7MOjlrT62wFhrzFo68IpXiRyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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