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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e159e1a089cf6811fc3c7bc18fa46f7fddfa73837f092ce794350b0b7294c3' 
  AND token = '4RJz8pDHY/DmanwFtje5Oh4doT6PEoxw6vb0XV69J3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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