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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946c8c5f912aa097de3ab9d0fcb4b2b1a59e629dad71a08ff03541837d2fe008' 
  AND token = '41qFYKKBNUzAj5dxY451tJeG0QLJeEcijRE/MhP4ho8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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