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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b563f37908dfe99bde31acc997e780cc25483d80cfdc0a89f084fc66b1f6cdd8' 
  AND token = 'orw005zlqRjbDLXSzZcUON8Lnk9e/vGUHDNXCMs3T0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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