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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9612a1f4c4c258d847c6e723619e294f78af36ecbdc3d8f71270951ebdf0d460' 
  AND token = 'NWC4l0+JNenLQ5oVmAI1jxTdZ+k83394U6mUN5TTPXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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