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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869c89607b0f24408172676b68438d61e39a57fed1be5a5cf025ef37f6d5f19f' 
  AND token = '7laRoypo3QKgXILdBr4oDz8FovdzWBc5b3MLAAAkIak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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