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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192c58d3137cab70e2f84e1987f09d542a868854dac4befe9f4bfb0097733a3a' 
  AND token = 'EVe3he2o4/8ROw8IXeC6z/1vwC5alEPbNS6AmRj1N1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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