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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab22db201c891c7f261224163a45bf8d53d81d7fc78f4410d93effefba1f5e8' 
  AND token = 'wO4W9d1xFXPydlYb8sXgyk9VEGVQpahyhkUxlMGR5cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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