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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '614992de5b1445b631d1a4f3afe47cdfc44e30c035b753828d2f076ea4fcacd1' 
  AND token = 'vPUYbRdbAazonFMuID79V38ReJlQa4M4UPQuaVSRLV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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