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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e789835807ae080a3a29da0209137522d4ad719af55d49b041be8819249e789f' 
  AND token = 'bmLfPUNAGzUuZBJzp/9hl9oFiE19HvcSqPy7TeRf2p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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