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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895dfe12ba1ca733995b68a6c8bceb3c22dace43b96f14ad8e90cff9fa28284a' 
  AND token = 'R2EUTb3o3HRuHj2O/65n0Lxd4qbCznqsV5c0j0mTQkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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