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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7696589c2f953eb36a0e3a9c2a66a7ee2447bd5d18746e439a02646a5a2e929d' 
  AND token = 'DPPLA6sC4xxEHLoxDUg46+7VQkAV6m4/gAqja0fJCKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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