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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890f43c77ec0869120b7770085c87b4ae62e4f0eb01b1f1548a0d197f1760cf8' 
  AND token = '16n9NyHyI8Z2+h6B2je+Vj+bzX5RRtXrtJ08CLWxe64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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