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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e464dde2227d13345befb2161c0862bc47243a878afff493bddd056b720b715' 
  AND token = 'skrynP5yk45v4KLwWkWw4PmxYvRf2ZSf1+1UNe/bITo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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