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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13504cf3d43ba5b787ccf944731c8c23bb9c85e1eb8cb516476433988afbbc9c' 
  AND token = '5H6WeOH4o9UTRTlgGg1H8d5fJS7oaNIztNBohysOVVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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