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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c9b5a3567d18feb73b7e8b3dac0c415dbec7e36560c76360df3c61a0931429' 
  AND token = 'I8Hg+6URQSuBB8jySUmqd37CLgNtxU+xRBYpU6qs3sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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