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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba19b749aac01928661a38184afdbabfab57ccd62b6be4d709e97e2eab07ead' 
  AND token = 'Sw25S05szt8d8bfMuAynHTFQd+Bw6TzLjRMepDivUiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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