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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c22a230d7c8fd14c994d986ab6e36c67d1b0be6eb41ccb54f8fc202ace26dd' 
  AND token = 'WgcMJIYisWhO6nT1CA5T6Bi2o90ijtfRpRDcnzvrsdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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