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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ebc3fce8751d1aab690198a1b3d06672658e8e8765c419fbb19608e22213ee' 
  AND token = '6qGbZ1ph2U7WwI5kTrNYucsJFMfv2KaCE0LjQp2o4Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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