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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c485b3fcf50950548fa0f7e40c3273d2a40d420f97a389254dc229779c738c7' 
  AND token = 'vd7jIRRGa2F4u2R7zY3oHMtN/pgqoV6wEgEY51ITWL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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