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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c685ea87361a611223ce1a7c87332995211c58710dbe176d7166ad260e4aba23' 
  AND token = 'h3gp4vLzMcKCVmor7l49Es4fdS1hf1B7B6xelCpjANE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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