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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34c96bb872dca610afd5181ed360ae3a3edae3ebefc592b53c0455e00b5e36d' 
  AND token = 'GYNii6IAMAjrZU1TsWUjoM6Mxb4JRm9STHRisYIWf54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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