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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f00a2c9915912ffaef51c5978e8d9370fae884508a9304db3c50c30387cf8e' 
  AND token = 'M+8ROlV6XCz5LHVp5oV/2IB5tWR+czMNV8PxKmXSokk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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