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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fcf4adc4ed29679e8d223e21771eb060d645c43294bd79cb924f8985c18315' 
  AND token = 't4VydnTWZnXFYU7hFAviWs1jsJEkX+xKFi/a7iTa6hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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