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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67633b6c57c3b8c6205903641bfbcd06f8ea73f283586a073303264b4c2343a1' 
  AND token = 'n5Ph4jVFDE//J4rVcgZsd0NigJM+gSY3jugizTKAC6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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