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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c0d83137e8f0148343274ab79739685a61dc64b6b95a951c36bf49be72745d9' 
  AND token = 'yJbyQeKzmxlCkUeoVdL9mI9x43/fJ2PJE2FamD76xOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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