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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1db447504ee98e62d68517ae67d234a7288f1db9ce8f9c07ed5df4183ad9f15' 
  AND token = 'bXrbx/g71kipkmYlBpNwUY/HtOQztGTaGNdvlyXp7/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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