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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a95231390a1ec7c1caa991fb9b48c745c57c3d48ea5e775ef5ef8bd00182f6' 
  AND token = 'e+d1GWxzWIIyinRJrni5mM18G9hukiEZ95JvrrCGQpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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