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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55899ed128a3df17da48bc44bacdbad20e0d93c279f67e36c1d2759488a02d92' 
  AND token = 'GT3VLVSJlLpje3R3yjdmeCv9IRTx4SvuhNgdcZVj8QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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