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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8337cb0c5e5648b7cfeba79e9817a7c70c2e2a2730288a3880c20c6f42db58c9' 
  AND token = '1j0SX1lpVO5RSrS3HD5F1KqJZF1wvaeEOXi2MgPHy/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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