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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53c0a4f68966e6b9afba0ebb0bff1d0b9156e29fa70edb5394e25169942273cf' 
  AND token = 'nQ982zOmHZIxC64Den9AxcZdUIVvAPiU4GycIAAqxuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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