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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937aaa29f98b83647eb38d01a236e8227c9c30eb4130dea4d18dcb290bb80be1' 
  AND token = 'LBAzWd+1v6OTtbwjVMen7mAN/+w9ZM4F6buFloWZr70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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