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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63432600ccce30b61b3ea9cce56c2d3d67d4be0228a5219b43a4504d8f07a9aa' 
  AND token = 'ACiiMeo4c4YXvxQKw5fvmZC5LCvXph2Plf6qkKelGuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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